Liquid Penetrant Testing

The Principle Behind LPT

A low-cost, highly effective method for detecting surface-breaking defects in non-porous materials. We offer both fluorescent and colour contrast dye inspection – in-house at our UKAS accredited laboratory and on-site across the UK.

Info Box

Penetrant Application

A liquid dye is applied to the component surface, seeping into any cracks, pores or surface defects through capillary action.

Info Box

Defect Revelation

After removing excess penetrant, a developer draws the dye back to the surface – making even hairline cracks clearly visible under white light or UV inspection.

square image (2)

Liquid Penetrant Testing

Where LPT Is Used

Castings & forgings

Detecting surface porosity and cracks in metal components
Contact Us

Weld inspection

Identifying surface defects in welded joints and fabrications
Contact Us

In-service components

Finding fatigue cracks in parts under regular stress
Contact Us

Non-metallic materials

Testing plastics and ceramics for surface-breaking flaws
Contact Us

NFW Inspection

Why Choose NFW?

A fast, reliable method for detecting surface and near-surface defects in conductive materials.

Hotspot Image

FAQ

What You Need to Know

Find answers to the most common questions about our NDT services, inspection methods and how we can support your project. Can’t find what you’re looking for? Get in touch – we’re here to help.

Non-Destructive Testing (NDT) refers to a range of inspection techniques used to evaluate the integrity, quality, or properties of materials and components without causing damage. This allows assets to remain in service while ensuring safety and compliance.
NDT is widely used across many industries, including:
  • Oil & Gas
  • Construction & Infrastructure
  • Manufacturing
  • Aerospace & Automotive
  • Power Generation
  • Marine & Offshore

Any industry where safety, reliability, and compliance are critical can benefit from NDT.

We offer a range of NDT techniques, including:
  • Ultrasonic Testing (UT)
  • Radiographic Testing (Film & Digital)
  • Magnetic Particle Inspection (MPI)
  • Dye Penetrant Inspection (DPI)
  • Visual Inspection (VT)
  • Eddy Current Testing (ECT)
  • and more….

Our team can advise on the most suitable method for your application.

The appropriate method depends on factors such as:
  • Material type
  • Component geometry
  • Defect type being investigated
  • Industry standards and regulations

Our certified technicians will assess your requirements and recommend the most effective and cost-efficient solution.

Yes. All inspections are carried out by fully qualified and certified NDT technicians, trained in accordance with recognised industry standards such as ISO, PCN, ASNT, or equivalent certification schemes.
Our UKAS Accreditation Certificate is available to download directly from our website. Please follow the provided link on our Certificates Download page to view or download the certificate.
A direct link is available on our Certificates Download page for your reference.
All our technicians hold recognised industry certifications. You can independently verify technician qualifications via the British Institute of Non-Destructive Testing (BINDT) PCN register. Please follow this link: https://www.bindt.org/Certification/pcn-certificate-verification Enter the surname of the technician to view their certification details.
Most NDT inspections are designed to be minimally disruptive and can often be performed on-site with little or no downtime. We work closely with clients to schedule inspections at convenient times.
Yes. After inspection, we provide clear, detailed reports outlining:
  • Inspection methods used
  • Findings and defect locations
  • Acceptance criteria
Reports can be tailored to meet client, regulatory, or project-specific requirements.
Absolutely. Our inspections comply with relevant international and industry-specific standards, including ISO, BS, ASTM, and project-specific specifications.
We aim to respond promptly to all enquiries. Depending on scope and location, inspections can often be arranged at short notice, including urgent or emergency call-outs.
We provide services locally and nationally. For larger projects, we can also support international work—please contact us to discuss your requirements.
You can request a quote by:
  • Completing our online enquiry form
  • Emailing our team
  • Calling us directly
We’ll review your requirements and provide a competitive, no-obligation quote.

NFW INSPECTION

.

Ready to Get Started?

Whether you need a one-off inspection or ongoing NDT support, our team is here to help. Get in touch today and let’s discuss your project requirements

LET’S TALK ABOUT IT